1346 THE VOYAGE OF H.M.S. CHALLENGER. 



and not half as broad ; the rami are narrowly lanceolate ; the inner about half the length 

 of the peduncle, the outer rather longer ; the broad peduncles of the third pair are of 

 almost uniform breadth except near the base ; the inner ramus is a third of the length of 

 the peduncle, not twice as long as broad, the outer is rather longer and narrower. All 

 the rami are finely, but more or less irregularly, pectinate on both margins ; this is also 

 the case with the inner and distal margins of the peduncles. 



Telson small and smooth-edged, broader than long, the sides a little concave, the 

 distal margin rounded, broad, though narrower than the base. 



Length, three-tenths of an inch, allowing four-thirtieths of an inch for the measure- 

 ment from the front of the head to the end of the peraaon, and five-thirtieths from the 

 base of the pleon to the extremity of the uropods. 



Locality. —April 26, 1876; off St. Vincent, Cape Verde Islands; lat. 16° 49' N.; 

 long. 25° 14' W.; surface temperature, 73°'2. Two specimens, male and female. 



Remarks. — The specific name is given in compliment to Professor Bovallius, who 

 instituted the genus Dairella. From his species Dairella latissima of the South 

 Atlantic, the present species is distinguished by the wrist of the first gnathopods not 

 being twice as long as the hand, and by having the peduncles of the first pair of 

 uropods much longer, instead of shorter, than those of the second pair. 



In the young ones taken from the mother's pouch, the seven pairs of limbs resemble 

 one another even more closely than in the adult ; only the first joint is elongate ; in 

 the last three pairs the base of the finger is scpiared, and the remaining part more 

 slenderly outdiawn than in the preceding pairs ; the pleon is strongly flexed against 

 the ventral surface, and several or all of its segments are coalesced, narrowing very 

 gradually to the apex, which is broadly rounded ; in this stage no pleopods, uropods, or 

 distinct telson, seem to be developed ; no trace of antennae could be perceived ; the 

 mouth-organs occupy nearly the whole breadth of the head, instead of a very small 

 portion of that breadth as in the adult, the outer plate of the first maxillae shows only a 

 single spine-tooth, and the palp resembles a rounded tubercle. 



Genus Phronima, Latreille, 1802. 



1802. Phronima, Latreille, Hist. Nat. gen. et part, des Crust, et des Inseetes, vol. iii. p. 38, and 



(1803), vol. vL p. 289. 



1806. „ Latreille, Genera Crust, et Ins., vol. i. 



1810. ,, Latreille, Consid. gen. Crust. Arachn. Ins., pp. 103, 422. 



1813. „ Leach, Crustaeeology, Edinburgh Encyclopaedia, vol. vii. p. 403. 



1814. „ Leach, Crust. App. Edinburgh Encyclopaedia, vol. vii. p. 433. 



1815. ,, Rafinesque, Analyse de la Nature. 



1815. „ Leach, Trans. Linn. Soc. Lond., vol. xi. pt. li. 



1816. Phronyme, Latreille, Nouveau Diet, d'hist. nat., t. i. p. 467. 



